38865861 has 6 divisors (see below), whose sum is σ = 56139590. Its totient is φ = 25910568.

The previous prime is 38865839. The next prime is 38865881. The reversal of 38865861 is 16856883.

It can be written as a sum of positive squares in only one way, i.e., 29224836 + 9641025 = 5406^2 + 3105^2 .

It is not a de Polignac number, because 38865861 - 2¹⁸ = 38603717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38865881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2159206 + ... + 2159223.

Almost surely, 2^38865861 is an apocalyptic number.

It is an amenable number.

38865861 is a deficient number, since it is larger than the sum of its proper divisors (17273729).

38865861 is a wasteful number, since it uses less digits than its factorization.

38865861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4318435 (or 4318432 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 38865861 is about 6234.2490325620. The cubic root of 38865861 is about 338.7318996515.

The spelling of 38865861 in words is "thirty-eight million, eight hundred sixty-five thousand, eight hundred sixty-one".